John in NM
I think that is what you are referring to. Kinda neat invention, along with the tissue paper bound volumes that went with them. The days before Xerox! I wonder if the millennials know that "xeroxing" used to mean the act of photocopying....

I used to love getting new Dixon #2's.... A couple years ago I bought a couple big packages of Ticonderogas on sale at Staples, I think it was 100 for $10.... figure that is close to a lifetime supply for the shop. If only I could get the wife to quit chewing them when she works in the shop!